Add avatars for guests

[Ivansss]

• Fix For guest who set their name, show first letter of name instead of question mark in grey avatar placeholder #278

[codecov]

Codecov Report

Merging #313 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #313   +/-   ##
=========================================
  Coverage     15.46%   15.46%           
  Complexity      274      274           
=========================================
  Files            18       18           
  Lines          1293     1293           
=========================================
  Hits            200      200           
  Misses         1093     1093

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[nickvergessen]

Having a guest named "Test" the admin still sees grey ? instead of colored T for me

[nickvergessen]

Works now